The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 1987
Filed:
Dec. 23, 1985
Ralph Miller, Pleasantville, NY (US);
T-Thermal Inc., Conshohocken, PA (US);
Abstract
A process for removing oxides of nitrogen from a gas in which the molar ratio of NO to NO.sub.2 is greater than 1. Sufficient NO is oxidized by the reaction NO+2HNO.sub.3 =H.sub.2 O+3NO.sub.2 by a solution whose HNO.sub.3 concentration is maintained above about 20% to form a gas whose molar ratio of NO to NO.sub.2 is close to 1. Substantially equivalent amounts of NO and NO.sub.2 are absorbed by a solution whose pH is maintained below about 2 containing HNO.sub.3 and dissolved NH.sub.3. The absorbed oxides of nitrogen react with the dissolved NH.sub.3 at a temperature above about 50.degree. C. to form elemental nitrogen and water. The process can be carried out in several steps or in substantially one step.